<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>框架集</title>
</head>
<frameset cols="25%,50%,25%">
    <frame src="https://www.w3school.com.cn/tags/tag_frame.asp" scrolling="no" noresize="noresize"></frame>
    <frame src="https://gitee.com/"></frame>
    <frame src="https://www.w3school.com.cn/tags/tag_frame.asp"></frame>
</frameset>
</html>
